Re: [Xen-devel] How to compile Xen 4.12 with Clang on Linux?

["Johnson, Ethan" <ejohns48@xxxxxxxxxxxxxxxx>]

On 6/20/19 7:01 PM, Andrew Cooper wrote:
> Xen itself doesn't use autoconf, and needs a bit of extra help getting
> its options in order.  There is an extra clang=y variable which you need
> to pass.
>
> xen.git$ make -C xen/ CC=clang-7 clang=y

Thanks! That seems to have worked.

Now I've got a new issue: it looks like Xen is trying to use an 
optimization flag that Clang doesn't like:

----------
[ 16%] Building C object crypto/CMakeFiles/tpm_crypto.dir/hmac.o
cd 
/home/ejohns48/Desktop/xen-4.12.0/stubdom/tpm_emulator-x86_64/build/crypto 
&& /usr/bin/clang-7  -I/opt/local/include 
-I/home/ejohns48/Desktop/xen-4.12.0/stubdom/tpm_emulator-x86_64 
-I/home/ejohns48/Desktop/xen-4.12.0/stubdom/tpm_emulator-x86_64/build 
-std=c99 -DTPM_NO_EXTERN -isystem 
/home/ejohns48/Desktop/xen-4.12.0/stubdom/../extras/mini-os/include 
-D__MINIOS__ -DHAVE_LIBC -isystem 
/home/ejohns48/Desktop/xen-4.12.0/stubdom/../extras/mini-os/include/posix 
-isystem 
/home/ejohns48/Desktop/xen-4.12.0/stubdom/../tools/xenstore/include 
-isystem 
/home/ejohns48/Desktop/xen-4.12.0/stubdom/../extras/mini-os/include/x86 
-isystem 
/home/ejohns48/Desktop/xen-4.12.0/stubdom/../extras/mini-os/include/x86/x86_64 
-U __linux__ -U __FreeBSD__ -U __sun__ -nostdinc -isystem 
/home/ejohns48/Desktop/xen-4.12.0/stubdom/../extras/mini-os/include/posix 
-isystem 
/home/ejohns48/Desktop/xen-4.12.0/stubdom/cross-root-x86_64/x86_64-xen-elf/include
 
-isystem /usr/lib/gcc/x86_64-linux-gnu/7/include -isystem 
/home/ejohns48/Desktop/xen-4.12.0/stubdom/lwip-x86_64/src/include 
-isystem 
/home/ejohns48/Desktop/xen-4.12.0/stubdom/lwip-x86_64/src/include/ipv4 
-I/home/ejohns48/Desktop/xen-4.12.0/stubdom/include 
-I/home/ejohns48/Desktop/xen-4.12.0/stubdom/../xen/include -mno-red-zone 
-O1 -fno-omit-frame-pointer -O1 -fno-omit-frame-pointer  -m64 
-mno-red-zone -fno-reorder-blocks -fno-asynchronous-unwind-tables -m64 
-DBUILD_ID -fno-strict-aliasing -std=gnu99 -Wall -Wstrict-prototypes 
-Wdeclaration-after-statement -Wno-unused-local-typedefs   
-fno-stack-protector -fno-exceptions -Wno-declaration-after-statement   
-Wall -Werror -Wextra -Wno-unused-parameter -Wpointer-arith -Wcast-align 
-Wwrite-strings -o CMakeFiles/tpm_crypto.dir/hmac.o   -c 
/home/ejohns48/Desktop/xen-4.12.0/stubdom/tpm_emulator-x86_64/crypto/hmac.c
clang: error: optimization flag '-fno-reorder-blocks' is not supported 
[-Werror,-Wignored-optimization-argument]
----------

I'm seeing this same error on other translation units as well when I run 
"make" with multiple threads (-j24).

Is this another thing I can fix with a flag or do I need to dig deeper?

Thanks,
Ethan

-- 
Ethan J. Johnson
Computer Science PhD student, Systems group, University of Rochester
ejohns48@xxxxxxxxxxxxxxxx
ethanjohnson@xxxxxxx
PGP public key available from public directory or on request

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